Piston-packing.



PATENTED JAN. 1, I907.

J. J. REDNER. PISTON PACKING.

1 API'LIOATION FILED JULY3,1906' wi/lmwwo JOHN JAMES REDNER, OF NEW YORK, N. Y.

PISTON-PACKING;

Specification of Letters Patent.

Patented Jan. 1, 1907.

Application filed July 3,1906. Serial No. 324,601.

It is essentially an improvement on my former patent, No. 769,566, of September 6,

1904, the object being, as in that case, not only to remedy defects existing in former piston-packin s of this type, but also to improve the pac ring made the subject-matter of my aforesaid patent.

The acking is known as a ring packing. It fits into a suitable cavity or recess in the piston and springs outwardly to make an intimate contact with the surrounding wall of the cylinder. In this connection I utilize by a certain feature of construction the pressure of the vapor or gas as'a means for effecting an even more intimate contact of the ring against the wall of the cylinder than the mere elasticity of said ring would afiord, thereby to a greater degree preventing leakage and holding compression than 1n my former constructionf In the drawings, Figure 1 is a longitudinal section of a port on of a cylinder, showing a piston therein with my improved packing applied thereto. Fig. 2 is a front elevation 0 one of the packin -rings detached... Fig. 3 is a detail View. 'ig. 4 is another detail view.

1 is a cylinder. 2 is a piston.

3 is a packing comprising a piece of resilient material, such as, a metal ring, said ring having by preference. a relatively hea body portion projecting into a groove in t e pis-. ton and a relativel li ht flangedportion, (indicated at 3 he anged portion overstands the piston and is located between the.

external wall thereof and the internal wall of "the cylinder. That edge of the piston against which pressure is applied is refera ly slightly beveled, so as to .cut nn er the flange 3*, whereby when ressur'e is a plied thereto the packing wili be' pressed wardly intointimate contact with the wall outof the cylinder. The end ring or rings only need be provided with these flanges to accomplish the aforesaid desirable results.

4 is an oflset portion at one side of the piston-packing, said offset portion overstanding both ends thereof and independent thereof, so that either of said ends may be moved toward or from each other and indepencl; ently of the said offset portion or block. The piston is suitably recessed to receivesaid offset portion. As retaining devices I'preferably provide pins 5 5, carried bfitlie block and projecting into grooves 66 in the ends ofthe main body of the ring li'ke packing.

Between the ends of the packing I provide a spacing lock or abutment which limits the compressive movement of the packi g to pre vent shearing the pins. This utment is indicated at 7 and is preferably carried by the offset 4.- To afford clearance for the abutment, the adjacent ends of the ring-like member may be cut away or notched, as indicated at 8 8, Fig. 4, leaving the bearingsurfaces which engage the cylinder solid and relatively close together.

The member 4 fills in the space between the ends ofthe split ring and prevents the steam incomplete circle the two ends thereofnearly meeting, having an independent offset portion at the side thereof overlapping both ends and admitting of independent movement of either end relatively thereto. and a stop-shoulder or abutment carried by and at the side of the independent offset portion intermediate to its ends and arranged to receive the thrust of the ends of the circular member, the two ends being cut away or recessed to receive said stop-shoulder.

2. A piston-packing comprising a piece of resilient material in the general form of an incomplete circle, the two ends thereof nearly meeting, having an inde endent ofl'set portion at the side thereo overlapping both ends and admitting of independent inove ment of either end relatively thereto, a stop-3 shoulder or abutment carried by the inde member but limiting the extent of aid movependent offset portiolu am} arlizmlged to 1re- Inent.

(:eive the thrust of t1e en l8 0 t 1e circu ar L 1 111G111b01',fl11d retaining-pins in one of said 'JOHB JAMES members and slots in the other member for Witnesses:

receiving said. pins to allow of the independ- F. E. MOORE,

ent movement of the ends of said ring-like CHAS. A. PEARD. 

